Maria Nguyen Tantsits, OD

Primary specialty

OptometristTaxonomy code 152W00000X

License

2020015819 Issued in MO

Practice address

621 S New Ballas Rd Ste 140a
Saint Louis, MO 63141-8254

Phone

(314) 251-6410

Fax

(314) 251-4392

NPI assigned

Jun 10, 2020

Last updated

Jan 23, 2026By the provider in NPPES

Sex

Female

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Enrolled in MO

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: No
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Optometry

Education

University of Missouri St Louis - School of Optometry, 2020

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Mercy Clinic Ophthalmology LLCGroup PAC ID 1951544428, 17 clinicians

Mercy Health Services LLCGroup PAC ID 2264329168, 3 clinicians

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

Practice roles

Locations

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

• Mercy Clinic Ophthalmology LLC

  • Ophthalmology Physician
  • Washington, MO
  • NPI 1003179656
  Medicare reassignment Care Compare group NPD
• Mercy Health Services, LLC

  dba Mercy Eye Care

  • Eyewear Supplier
  • Saint Louis, MO
  • NPI 1730224478

  Optometrist

  Medicare reassignment Care Compare group NPD
• Mercy Health Services, LLC

  dba Mercy Eye Care

  • Eyewear Supplier
  • Washington, MO
  • NPI 1164567897

  Optometrist

  NPD
• Mercy Health, Services, LLC

  dba Mercy Corporate Health

  • Corporate Health Clinic/Center
  • Creve Coeur, MO
  • NPI 1689714743
  NPD (past)

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1591747200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1769126400000",
    "number": "1528683190",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "621 S NEW BALLAS RD STE 140A",
            "city": "SAINT LOUIS",
            "state": "MO",
            "postal_code": "631418254",
            "telephone_number": "314-251-6410",
            "fax_number": "314-251-4392"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "621 S NEW BALLAS RD STE 140A",
            "city": "SAINT LOUIS",
            "state": "MO",
            "postal_code": "631418254",
            "telephone_number": "314-251-6410",
            "fax_number": "314-251-4392"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "34 Hampton Village Plz",
            "address_purpose": "LOCATION",
            "city": "Saint Louis",
            "state": "MO",
            "postal_code": "631092127",
            "country_code": "US",
            "telephone_number": "314-752-2679",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "TANTSITS",
        "first_name": "MARIA",
        "middle_name": "NGUYEN",
        "name_prefix": "Dr.",
        "credential": "OD",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2020-06-10",
        "last_updated": "2026-01-23",
        "certification_date": "2026-01-23",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "152W00000X",
            "taxonomy_group": "",
            "desc": "Optometrist",
            "state": "MO",
            "license": "2020015819",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Marilyn Kaye Tanner-Blasiar, RD
• Sadie Tanner-Pobocik, LPC
• Andrew Tanous
• Lamiya Tanovic
• Catherine Tansey, MSW, LCSW
• Ali Tanvir
• Tyler R Tanzyus, FNP-BC
• Richard S Tao, MD
• Ting Yin Tao, MD
• Yongping Tao, MD

• Optometrist in Saint Louis, MO
• Providers in Saint Louis, MO by specialty
• Optometrist in Missouri

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jan 23, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.